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@glimmer/runtime

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Minimal runtime needed to render Glimmer templates

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import { APPEND_OPCODES } from '../opcodes'; import { $pc, $ra, $fp, $sp } from '@glimmer/vm'; import { assert } from '@glimmer/util'; export function initializeRegisters() { return [0, -1, 0, 0]; } export function initializeRegistersWithSP(sp) { return [0, -1, sp, 0]; } export function initializeRegistersWithPC(pc) { return [pc, -1, 0, 0]; } var LowLevelVM = /*#__PURE__*/function () { function LowLevelVM(stack, heap, program, externs, registers) { this.stack = stack; this.heap = heap; this.program = program; this.externs = externs; this.registers = registers; this.currentOpSize = 0; } var _proto = LowLevelVM.prototype; _proto.fetchRegister = function fetchRegister(register) { return this.registers[register]; }; _proto.loadRegister = function loadRegister(register, value) { this.registers[register] = value; }; _proto.setPc = function setPc(pc) { false && assert(typeof pc === 'number' && !isNaN(pc), 'pc is set to a number'); this.registers[$pc] = pc; } // Start a new frame and save $ra and $fp on the stack ; _proto.pushFrame = function pushFrame() { this.stack.push(this.registers[$ra]); this.stack.push(this.registers[$fp]); this.registers[$fp] = this.registers[$sp] - 1; } // Restore $ra, $sp and $fp ; _proto.popFrame = function popFrame() { this.registers[$sp] = this.registers[$fp] - 1; this.registers[$ra] = this.stack.get(0); this.registers[$fp] = this.stack.get(1); }; _proto.pushSmallFrame = function pushSmallFrame() { this.stack.push(this.registers[$ra]); }; _proto.popSmallFrame = function popSmallFrame() { this.registers[$ra] = this.stack.pop(); } // Jump to an address in `program` ; _proto["goto"] = function goto(offset) { this.setPc(this.target(offset)); }; _proto.target = function target(offset) { return this.registers[$pc] + offset - this.currentOpSize; } // Save $pc into $ra, then jump to a new address in `program` (jal in MIPS) ; _proto.call = function call(handle) { false && assert(handle < 0xffffffff, "Jumping to placeholder address"); this.registers[$ra] = this.registers[$pc]; this.setPc(this.heap.getaddr(handle)); } // Put a specific `program` address in $ra ; _proto.returnTo = function returnTo(offset) { this.registers[$ra] = this.target(offset); } // Return to the `program` address stored in $ra ; _proto["return"] = function _return() { this.setPc(this.registers[$ra]); }; _proto.nextStatement = function nextStatement() { var registers = this.registers, program = this.program; var pc = registers[$pc]; false && assert(typeof pc === 'number', 'pc is a number'); if (pc === -1) { return null; } // We have to save off the current operations size so that // when we do a jump we can calculate the correct offset // to where we are going. We can't simply ask for the size // in a jump because we have have already incremented the // program counter to the next instruction prior to executing. var opcode = program.opcode(pc); var operationSize = this.currentOpSize = opcode.size; this.registers[$pc] += operationSize; return opcode; }; _proto.evaluateOuter = function evaluateOuter(opcode, vm) { if (false /* LOCAL_DEBUG */ ) { var _this$externs = this.externs, debugBefore = _this$externs.debugBefore, debugAfter = _this$externs.debugAfter; var state = debugBefore(opcode); this.evaluateInner(opcode, vm); debugAfter(state); } else { this.evaluateInner(opcode, vm); } }; _proto.evaluateInner = function evaluateInner(opcode, vm) { if (opcode.isMachine) { this.evaluateMachine(opcode); } else { this.evaluateSyscall(opcode, vm); } }; _proto.evaluateMachine = function evaluateMachine(opcode) { switch (opcode.type) { case 0 /* PushFrame */ : return this.pushFrame(); case 1 /* PopFrame */ : return this.popFrame(); case 3 /* InvokeStatic */ : return this.call(opcode.op1); case 2 /* InvokeVirtual */ : return this.call(this.stack.pop()); case 4 /* Jump */ : return this["goto"](opcode.op1); case 5 /* Return */ : return this["return"](); case 6 /* ReturnTo */ : return this.returnTo(opcode.op1); } }; _proto.evaluateSyscall = function evaluateSyscall(opcode, vm) { APPEND_OPCODES.evaluate(vm, opcode, opcode.type); }; return LowLevelVM; }(); export { LowLevelVM as default }; //# 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{ Option, RuntimeHeap, MachineOp, RuntimeProgram, RuntimeOp } from '@glimmer/interfaces';\nimport { APPEND_OPCODES } from '../opcodes';\nimport VM from './append';\nimport { LOCAL_DEBUG } from '@glimmer/local-debug-flags';\nimport { MachineRegister, $pc, $ra, $fp, $sp } from '@glimmer/vm';\nimport { assert } from '@glimmer/util';\n\nexport interface LowLevelRegisters {\n  [MachineRegister.pc]: number;\n  [MachineRegister.ra]: number;\n  [MachineRegister.sp]: number;\n  [MachineRegister.fp]: number;\n}\n\nexport function initializeRegisters(): LowLevelRegisters {\n  return [0, -1, 0, 0];\n}\n\nexport function initializeRegistersWithSP(sp: number): LowLevelRegisters {\n  return [0, -1, sp, 0];\n}\n\nexport function initializeRegistersWithPC(pc: number): LowLevelRegisters {\n  return [pc, -1, 0, 0];\n}\n\nexport interface Stack {\n  push(value: unknown): void;\n  get(position: number): number;\n  pop<T>(): T;\n}\n\nexport interface Externs {\n  debugBefore(opcode: RuntimeOp): unknown;\n  debugAfter(state: unknown): void;\n}\n\nexport default class LowLevelVM {\n  public currentOpSize = 0;\n\n  constructor(\n    public stack: Stack,\n    public heap: RuntimeHeap,\n    public program: RuntimeProgram,\n    public externs: Externs,\n    readonly registers: LowLevelRegisters\n  ) {}\n\n  fetchRegister(register: MachineRegister): number {\n    return this.registers[register];\n  }\n\n  loadRegister(register: MachineRegister, value: number) {\n    this.registers[register] = value;\n  }\n\n  setPc(pc: number): void {\n    assert(typeof pc === 'number' && !isNaN(pc), 'pc is set to a number');\n    this.registers[$pc] = pc;\n  }\n\n  // Start a new frame and save $ra and $fp on the stack\n  pushFrame() {\n    this.stack.push(this.registers[$ra]);\n    this.stack.push(this.registers[$fp]);\n    this.registers[$fp] = this.registers[$sp] - 1;\n  }\n\n  // Restore $ra, $sp and $fp\n  popFrame() {\n    this.registers[$sp] = this.registers[$fp] - 1;\n    this.registers[$ra] = this.stack.get(0);\n    this.registers[$fp] = this.stack.get(1);\n  }\n\n  pushSmallFrame() {\n    this.stack.push(this.registers[$ra]);\n  }\n\n  popSmallFrame() {\n    this.registers[$ra] = this.stack.pop();\n  }\n\n  // Jump to an address in `program`\n  goto(offset: number) {\n    this.setPc(this.target(offset));\n  }\n\n  target(offset: number) {\n    return this.registers[$pc] + offset - this.currentOpSize;\n  }\n\n  // Save $pc into $ra, then jump to a new address in `program` (jal in MIPS)\n  call(handle: number) {\n    assert(handle < 0xffffffff, `Jumping to placeholder address`);\n\n    this.registers[$ra] = this.registers[$pc];\n    this.setPc(this.heap.getaddr(handle));\n  }\n\n  // Put a specific `program` address in $ra\n  returnTo(offset: number) {\n    this.registers[$ra] = this.target(offset);\n  }\n\n  // Return to the `program` address stored in $ra\n  return() {\n    this.setPc(this.registers[$ra]);\n  }\n\n  nextStatement(): Option<RuntimeOp> {\n    let { registers, program } = this;\n\n    let pc = registers[$pc];\n\n    assert(typeof pc === 'number', 'pc is a number');\n\n    if (pc === -1) {\n      return null;\n    }\n\n    // We have to save off the current operations size so that\n    // when we do a jump we can calculate the correct offset\n    // to where we are going. We can't simply ask for the size\n    // in a jump because we have have already incremented the\n    // program counter to the next instruction prior to executing.\n    let opcode = program.opcode(pc);\n    let operationSize = (this.currentOpSize = opcode.size);\n    this.registers[$pc] += operationSize;\n\n    return opcode;\n  }\n\n  evaluateOuter(opcode: RuntimeOp, vm: VM) {\n    if (LOCAL_DEBUG) {\n      let {\n        externs: { debugBefore, debugAfter },\n      } = this;\n      let state = debugBefore(opcode);\n      this.evaluateInner(opcode, vm);\n      debugAfter(state);\n    } else {\n      this.evaluateInner(opcode, vm);\n    }\n  }\n\n  evaluateInner(opcode: RuntimeOp, vm: VM) {\n    if (opcode.isMachine) {\n      this.evaluateMachine(opcode);\n    } else {\n      this.evaluateSyscall(opcode, vm);\n    }\n  }\n\n  evaluateMachine(opcode: RuntimeOp) {\n    switch (opcode.type) {\n      case MachineOp.PushFrame:\n        return this.pushFrame();\n      case MachineOp.PopFrame:\n        return this.popFrame();\n      case MachineOp.InvokeStatic:\n        return this.call(opcode.op1);\n      case MachineOp.InvokeVirtual:\n        return this.call(this.stack.pop());\n      case MachineOp.Jump:\n        return this.goto(opcode.op1);\n      case MachineOp.Return:\n        return this.return();\n      case MachineOp.ReturnTo:\n        return this.returnTo(opcode.op1);\n    }\n  }\n\n  evaluateSyscall(opcode: RuntimeOp, vm: VM) {\n    APPEND_OPCODES.evaluate(vm, opcode, opcode.type);\n  }\n}\n"],"sourceRoot":""}